Balanced slide-valve



m Z w x l p Z N f \\\\\\\\\\\\\\Y n a 2 w A u w a w P n J w F (No Model.)

H. G. KRIETE.

BALANCED SLIDE VALVE. v

IL PETERS. Pholvljlfwgnplwr, Washington. D. C.

UNrr-nn STATES PATENT Carton.

HENRY C. KRIE'IE, OF CHICAGO, ILLINOIS.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 256,146, dated April 11, 1882,

Application filed December 14, 1831.

To all whom it may concern:

Be it known that I, HENRY O. KRIETE, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Balanced Slide-Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The nature of my invention relates to slidevalves for steam-engines that regulate the admission and exhaust of steam to and from either end of the cylinder, and more particularly the invention relates to improvements in that class of slide-valves which are arranged with packing-rin gs that slide against the steamchest cover and exclude the steam from the upper or outward surface of the valve, so as to counterbalance the pressure of the steam acting upon the valve from all sides, and to relieve said valve of the tremendous friction, and the wear and tear connected therewith, that is to be overcome in a common slide-valve.

My invention consists in the peculiar construction and arrangement of the top of the slide-valve, and of the packin g-rin gs thereto, as hereinafter described, and pointed out by the claims.

In the accompanying drawings, Figure 1 represents a plan view of the valve without the packing-rings; Fig. 2, a longitudinal vertical section of the valve, shown in connection with the valve-seat of the cylinder and with the steam-chest cover Fig. 3, a transverse vertical section of the valve; and Fig. at an elevation of theinner packin g-rin g and wed ge-block.

Like letters represent corresponding parts in all the figures.

A denotes the valveface of the cylinder, having steam-ports a and exhaust-port b.

B is the slide-valve having steam-ports c, which are open to both sides of the valve, so as to give free admission for the steam in the steam-chest, and d e are exhaust-ports which communicate with the exhaust-port b in the cylinder. The valve-rod is passed through a hole, f, of the valve, and is to be secured and adjusted by nuts at each end in the usual manner.

(No model.)

Upon the top of the valve is formed a circular plate, g, having an inner annular flange, h, and an exterior annular flange, i. The annular chamber between these flanges is to be turned true and smooth in a lathe for holding the packing-rings. These rings j and 7c are turned conical, and so that the ring 70 enters the ringj, and forms'a steam-tight joint therewith, and that both rings pass over and form a close joint with the annular flange h. The exterior rin g, j, with its broad face, rests against the planed and scraped under side surface of the steam-chest cover D. This exterior ring, j, is solid, while ring it is split at one point, and its ends are fitted to form joints with a triangular or wedge-like segment, Z. This ring k is supported, and is pressed upward between the ring j and the flange h by a series of coiled springs, m, so as to close the joints hermetically, and the wedge-block l is also pressed upward by a coiled spring, m, for hermetically closing the joints of the split or opening of ring is. The springs m are placed in sockets n, drilled into the valve-plate g. The annular flange a is not intended to form a close joint with the packing '-ring j, but is to form a guard against pieces of a broken spring working out and catching between the valve and the ports of the cylinder and damaging the valve-seats.

As will be noticed, the above combination of the annular flanges hand i, with the solid ring j and the split ring 70, having segmental wedge l, and both rings being conical, the ring is bein g pressed between the ring j and the internal flange h, no leakage is possible after the joints have once been fitted true, and all wear is compensated by ring In The surface covered by the rin g j should be nearly equal to the surface of the valve against the valve-face of the cylinder, so as to hold said valve to its seat with but very little over pressure.

A hole may be drilled through the steamchest cover, which forms a communicating channel between the chamber inside of the packing-rings j and k and the exterior atmosphere, so that any steam leaking through the packing-rings will have a free escape, and will :00

not increase the pressure upon said valve.

What I claim is-- 1. The valve B, having acircular top, g, provided with an inner annular flange, h, and eX- terior annular or guard flange, i, in combination with the solid conical ringj, split conical ring 70, the segmental wedge-block l, and the coiled springs m, for supporting said ring 7c and block I, substantially as and for the purpose described and shown.

2. The valve B, valve-plate g, having annular flanges h i, sockets a between said flanges,

solid conical exterior ring, j, having its broad face resting against the under surface of the steam-chest coverD, the inner annular conical split ring, k, coiled springs m, resting within said sockets a, and operating to support and 15 press upward said ring 7c, and the wedge-block Z, also supported and pressed upward by a spiral spring, on, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as 20 my invention I affix my signature in presence of two witnesses.

HENRY O. KRIETE. Witnesses:

F. W. KASEHAGEN, H. PAUSTIAN. 

